What is the primary purpose of an astronomical telescope?
A) to magnify and make distant objects appear closer
B) to separate light into its component colors
C) to measure the intensity of light very accurately
D) to access wavelengths that we cannot see visually
E) to collect a lot of light and bring it to a focus
E
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A 6.0
resistor and a 3.0
resistor are connected in parallel to a 1.5 V battery of negligible internal resistance. What is the current in the 3.0
resistor?
A. 2.0 A B. 0.50 A C. 0.25 A D. 0.17 A E. 0.75 A
Would you expect the wire temperature to be greater or less for a number 18 copper wire as compared to a number 14 copper wire, both conducting the same electrical current?
What will be an ideal response?
What is the effect of the expansion of the universe?
a. The distant galaxies are getting farther apart from each other. b. Each galaxy is getting larger. c. The solar system is getting larger. d. All of the above.
The luminosity of a Seyfert galaxy varies with a regular period of months or years
a. True b. False Indicate whether the statement is true or false